Automatic shut-off valve



W. L'. ABEL AUTOMATIC SHUT-OFF VALVE Marh 12, 1929.

Filed NON. l5, 1927 8. W a yf f 3 a; .7 Z ,M// v |1|| J5 Wm Z mmmParenteelL Mar. 12, 1929.

UNITED STATES WALTER L. ABEL, OF HOMINY, GKLAHOMA.

AUTOMATIC SHUT-'DFF VALVE.

Application filed November 15, 1927. Serial No. 233,390.

This invention relates to improvements in shut-oil;l valves which aredesigned to shut ofi the flow therethrough of gas or liquid' underpressure.

rlhe primary object of the present invention is to provide an improvedvalve which will automatically shut oil the 'flow of or liquidtherethrough when the pressure of the latter unduly lowers ordiscontinues from any cause7 and which will thereafter continue to actas a positive shut-oil1 for said flow until said valve is manuallyopened.

A further object is to provide an automatic shut-oli valve that shall bepositive in acti-on, simple in construction, not liable to readily getout of working order, and cheap to manufacture.

The invention consists in the novel torni, combination and arrangemento'i parts hereinafter more ully described, shown in the accompanyingdrawing and claimed.

In the drawing:

Figure 1 is a side elevational view ot a shut-oft valve embodying thepresent invention.

Figure 2 is a central vertical sectional view thereof;

Figure 3 is a transverse horizontal section on line 3-3 of Figure 1; and

Figure 4 is an elevational view of the movable valve element, andillustrating a modilied form of stem or the piston of said element. f

Referring more in detail to the drawing, 5 indicates an uprightcylindrical casing closed at the top by a screw cap 6 and having a sideinlet connection 7 and a bottom outlet connection 8 for beingrespectively coupled or connected to gas or fluid supply and outletpipes. The casing has a bottom outlet port formed to provide a seat 11for a downwardly seating weighted ball valve 12 which is suspended by achain 12L from a hollow piston 12b having a rigid rod or stein 13 thatis arranged axially of the casing 5. The inlet port of the connection ornipple 7 is disposed intermediate the ends of the casing, as shown.

The piston 12zt is fitted and reciprocable in the casing 5, and the ballvalve 12 normally lowers by gravity to closed or seated position withthe piston disposed below the side inlet as shown by dotted linesinFigure 2.

The stem 13 slidably projects upwardly through a central aperture 18 inthe cap 6 as well as through a hollow boss 19 on said 1n operation, thecap 21 is removed and stem 13 is lifted to open the valve 12 with pistonvalve 12" disposed above the inlet port, so that unobstructed liow etthe gas or liquid may be had through the casing 5 when the outlet lineopened. The pressure o1 the gas or liquid acting on the under side ofthe piston 12b will result in retaining the valve open as long as thepressure is maintained in the supply. line or in not unduly loweredtherein.

Should the pressure be discontinued or unduly lowered 'from any cause,the weight of ball valve 12 will cause the latter to lower to closedposition on seat 11, and should 'the pressure be thereaiter continuedagain or raised to normal, the saine will aet on top of piston 12b andhold the valve closed. 1t is, therefore, evident that the flow ot thegas orliquid will be el'l'ectively cut oli" until the valve 12 is againmanually opened.

The lowering movement of piston 12b may be limited by internal stop lugs22 on easing 5 below the inlet connection 7. y

The under side oi cap 6 is preferably recessed about the opening 18V toAtorni a con-- cavo-spherical seat 23, and the top 24 of piston 12b isshaped to lit and engage this seat, when raised, so as to preventleakage of the gas or fluid out through opening 18 should it possiblyleak between the casing and the piston when the valve is open.

lt desired, the cap 21 may be dispensed with, and the upper end ofstein` 13 may be formed with a linger piece or loop 25 to facilitategrasping thereof to open the valve, as shown in Figure 4. Y

Minor changes may be made without departing from the spirit and scope ofthe invention as claimed.

What I claim as new is:

1. An automatic or liquid shut-oli" Vvalve comprising an. uprightcylindrical casing closed at its upper end and having a side inlet portand a bottom outlet port, a stem disposed axially oi the casing andhaving a rigid piston at its lower end, a weighted ball valve suspendedfrom the piston and adapted to seat downwardly to normally close saidoutlet port, said stem slidzibly projecting through the top of theCasingfsaicl piston loeing adapted to move above the inlet port whentlie Valve is raised to ogen position and being Slidztbly fitted in thecasing, the top of the Casing' being loi'ined with e seat on .the undereide tlieieo' about the Stein, seid piston being adapted and shaped etthe top to engage the latter seat when the Valve is opened to preventleakage through the top of the casing.

2. ln an automatic gas oi' liquid sluit-oli1 vulve comprising :inupright cylindrical easing closed at its uppei end und having e. Sideinlet port and aV bottoinoutl et port, e stein disposeclaxielly-of theeasing'and lievingeiigid piston-at its loweiI end, u weighted ball vulvesuspended from the rpiston and adapted to Seat downwardly to normallyclose seid outlet port, seid stein slidebly I Jiojeeting through the topof the easing, Seid piston being' adopted to inove'ziliove the inletport when tlie Valve is raised to open position, unl being,v elitlablyiittecl in the casing, and internal stop lugs o n the easing below theinlet poi-t foi' limiting the lowering ii'iovement ofthe piston.

In testimony Wliei'eoiz l etlix my Signature.

t VALTER .L AB EL.

